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  1. Mac001

    HELP ON AMMONIUM SULFATE SOLUTION

    Does anyone know where to find or how to calculate the properties of a solution water + 30% (in vol)ammonium sulfate ? ( or similar). I need viscosity, conductivity , density , heat capacity and enthalpy . I've asked to my customer, but it's a huge company and it's difficult to get an answer (...
  2. Mac001

    HEELP !! safety Tubes ( double wall)

    Thank you very much for the help and the precious tips !!
  3. Mac001

    HEELP !! safety Tubes ( double wall)

    Actually the tube is finned on both side internally and externally . THe question is how it will behave externally with the new fins? Thank you very muche for the tip for the series !!
  4. Mac001

    HEELP !! safety Tubes ( double wall)

    By the way I have another issue !! THe tube is finned with 19 FPI geometry. the conductivity value that i'm going to insert will not "interfere" with the parameters of the finns ( which are in copper). I mean it has sense simulate the air just changing the conductivity values , or it's a too...
  5. Mac001

    HEELP !! safety Tubes ( double wall)

    Oops i forgot, the temperatura will be around 40°C
  6. Mac001

    HEELP !! safety Tubes ( double wall)

    Right question !! Since the pressure will be at around 15 bar. Since the conductivity is very low, this could be a relevant step in the right direction !! Thank you very much for the tip !! Do you know where I could find a table with these values ? Thank you very much !!
  7. Mac001

    HEELP !! safety Tubes ( double wall)

    THank you for the help !! By considering the air a pure conductive medium, I should consider it like a tube with a thickness of 19.05-12 =3.5 mm with a resistance due to the sum of (2.5/K(copper) + 0.25/K(air) +1/Kcopper) or more simply 0.25/K(air).
  8. Mac001

    HEELP !! safety Tubes ( double wall)

    Hi there !! How can I calculate with HTRI an exchanger with double wall tubes. It's practically a safety exchanger with a OD 19.05mm ( ID 14.5 mm) 19 FPI copper tube on the outside and 1 OD 14mm tube on the inside (ID ~12 mm)? Hoe can I simulate such a tube ? (Let's say that: in the...
  9. Mac001

    difference AISI 316 L and 316 Ti with smoke

    I mean For the condensing unit .. tubes in Cu/ni and plates cladded with Cu/ni
  10. Mac001

    difference AISI 316 L and 316 Ti with smoke

    What would happend ,if I would use Cu/ni instead of AISI 316 for the tubes and I would clad the plate with AISI 316?
  11. Mac001

    difference AISI 316 L and 316 Ti with smoke

    The heat recovery will work with water up to 95°C ( in the first exchanger)and 45°C ( in the second) .. the working temperature of the tubes will be very low, in counterflow will be approx 200-250°C The plant will be located in Germany in an industrial zone , but i don't know other details...
  12. Mac001

    AISI 316L AISI 316 Ti selection help

    What's the difference betwheen 316L and 316Ti in tubes 18mmx 1mm in contact with CH4 smoke ? at 450°C and with condensate (PH 2-3) at 120°C thank you in advance !!
  13. Mac001

    difference AISI 316 L and 316 Ti with smoke

    I'm working at a heat recovery exchanger connected in line with an CH4 engine . the fisrt exchanger will have inlet temp 440° and outlet temp 120°C The inlet temperature will be 120°C and outlet 50°C. I'm selecting the tubes material and i'm considering AISI316L but a some source insist for...
  14. Mac001

    HELP SEALS BIOGAS

    Thank you for the advice !!
  15. Mac001

    HELP SEALS BIOGAS

    Other data: Temperature 30°C Pressure from 0.5 Bar to 1 Bar the vapor content is max 10% The trouble is which kind of gasket shall I use !! It's difficult to find a polimer which works well with all those materials !!
  16. Mac001

    HELP SEALS BIOGAS

    Hi !! I'm working at an BIOGAS receiver. The BIOGAS came from WASTE and does not have any zootechnical origin) I have looked at the "general" BIOGAS specs and I have found these components: 1) H2S Hydrogen SOLFIDE 2) Ammonia 3) CH4 Methane (of course) 4) Carbonic acid (also called areal acid)...
  17. Mac001

    SEAWATER - AMMONIA Exchanger tubes selection

    You are right, I will try to dimension the condenser for smooth plain tubes.
  18. Mac001

    SEAWATER - AMMONIA Exchanger tubes selection

    Opps I forgot ... In order to improove the exchange ratio ,the tube will be finned , how does the duplex behave compared with AISI 316 or titanium . I think that i will need at least 1.65 mm which is 0.065''
  19. Mac001

    SEAWATER - AMMONIA Exchanger tubes selection

    Thank you for your answers this is an normal ammonia cicle not a low temperature one. The condensing temperature is 35°C with Seawater entering at 30°C . So there will should be no problem with low temperature. In any case in order to avoid any surprise, I will rate the exchanger for a range...
  20. Mac001

    SEAWATER - AMMONIA Exchanger tubes selection

    Can anyone help me? the exchanger is SEawater tube side and ammonia shell-side I discarded CU/ni and AISI 316 ... Someone suggested titanium, i think it should be ok , but i'm looking for something less expensive. What do you think OF AISI 446/447 and duplex 2507 ? what are they cheaper (...

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